Incandescent lamp



19531- J. w. GILLELAND ET AL INCANDESCENT LAMP Filed May 10, 1950 En age/" M Patented Dec. 8, 1931 UNITED STATES PATENT. OFFICE JOHN W. GILLELAND, CLINTON A. MCHENRY, AND HOMER G. KRUEGER, OF MUSCATINE, IOWA.

INGANDESCENT LAMP Application filed May 10,

This invention relates to improvements in incandescent lamps and has for its primary object to provide an attachment for an incandescent lamp which is placed therein durvide an improved incandescent lamp of the above described character which in addition to being more eflicient than the ordinary type of lamp, may be produced at approximately the same or a very little more than the cost of producing the ordinary lamp.

The invention will behest understood from a consideration of the following detailed description taken in connection with the accompanying drawings forming part of this specification, with the understanding, however, that the invention is not confined to any strict conformity with the showing of the drawings but may be changed or modified so long as such changes or modifications mark no material departure from the salient features of the invention as expressed in the appended claim.

In the drawings Figure 1 is a view in longitudinal section of an incandescent lamp constructed ,in accordance with our invention.

Figure 2 is a sectional view taken on the line 22 of Figure 1.

Referring more particularly to the-draw ings wherein like numerals 'of reference indicate corresponding parts throughout the several views, the numeral 1 indicates generally an incandescent lamp of one of a number of various forms, the bulb or globe thereof being indicated by the numeral 2 and the base by the numeral 3.

Within the bulb 2 there extendslongitudinally through the neck portion of the bulb from the base 3 the usuallass filament supporting rod 4 the lower en of which is slightly enlarged as indicated at 5, in the usual manner, through which enlarged portion of the filament carrying wires 6 extend, emerging therefrom at the point where the rod 4 1930. Serial No. 451,458.

joins the base portion 5 to extend toward the forward end of the globe at opposite sides of the rod in the manner shown.

Upon the forward end of the rod 3 there is fixed a. glass bulb 7 which, as shown, is substantially pear shaped or ovoid in outline, the smaller end being attached to the rod.

The interior surface of this ovoid bulb 7 is coated with suitable material to give the same a mirrored appearance from the exterior. lVhile silvering of the interior surface is preferred it is, of course, to be understood that we do not wish to be limited in this respect for many other types of coating material may be effectively employed.

Surrounding the bulb 7 and in relatively close proximity to the surface thereof is the lamp filament 8 the ends of which are attached to the'wires 6 in the usual manner and extending upwardly along the smaller end of the bulb 7 from the end of the rod 4 are the filament support bars 9.

From the foregoing it will be seen that the bars 9 which support the filament 8 form a cup into which the reduced or constricted end of the bulb 7 extends and the filament is located a slight distance, preferably about one-eighth of an inch, inwardly from the center of the reflecting-bulb 7. With this construction the li ht emitted by the filament 8 will be even y dispersed in all directions radially from the bulb 7 by which the filament is surrounded.

Having thus described our invention, what we claim is:

- In an incandescent lamp, including a globe, a base and a filament supporting rod within the globe and carried by the base; a transparent bulb of substantially pear-shape conguration secured at its smaller end to the free end of said rod silvering material upon the inner face of said bulb a plurality of wire bars secured to the bulb at the point of jointure of the same with the rod and extending forwardly in 010%, substantially parallel relation along the tapered portion of the bulb a filament wire suspended from the free ends of said bars and encircling the bulb inwardly of the widest portion thereof, and current carrying wires connected with the filament, said filament being arranged in close proximity to the bulb.

In testimony whereof we hereunto aflix our signatures.

JOHN W. GILLELAND. CLINTON A. MoHENRY. HOMER G. KRUEGER. 

